Motor assembly structure

ABSTRACT

A motor assembly structure including a first bracket and a second bracket which together form a coil unit. The first bracket has a hub integrally extending from the first bracket into the second bracket. The motor assembly structure further includes a silicon steel plate unit fitted around the hub and sandwiched between the first bracket and the second bracket. The first bracket and the hub are integrally formed as a module so that the assembling procedure of the motor assembly structure is facilitated.

BACKGROUND OF THE INVENTION

The present invention is related to a motor assembly structure which can be easily assembled.

FIG. 4 shows a conventional locator assembly including a bush 6, a coil unit 7 and a central shaft 8 drivingly connected with the vanes. The bush 6 is fitted in the coil unit 7. A bearing 60 is mounted in the bush 6 and the central shaft 8 is fitted through the bearing 60 as shown in FIG. 5. The vanes 81 are connected with one end of the central shaft 8 distal from the bush 6. The coil unit 7 serves to drive the vanes 81 to rotate.

The assembly of the above components is complicated. First, the bush 6 must be fixed with a base seat 62. Then the entire coil unit 7 is fitted around the bush 6. Finally, the central shaft 8 is coupled with the bush 6.

The above assembling procedure is quite time-consuming. Moreover, the conventional locator assembly includes numerous components so that the manufacturing cost is high. In addition, the components must be precisely manufactured so that they can be snugly adapted to each other. These components are mass-produced and it is hard to precisely manufacture every components. In the case that the size of some of the components fails to meet the specification, the ratio of good products will be greatly reduced.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide a motor assembly structure including a first bracket and a second bracket which together form a coil unit. The first bracket has a hub integrally extending from the first bracket into the second bracket. The first bracket itself integrally has a hub so that an operator only needs to assemble the first and second brackets to fix the silicon steel plate unit. Therefore, the number of the components is reduced and the tolerance of the assembly of the components is minified. Also, the assembling procedure of the motor assembly structure is facilitated.

According to the above object, the motor assembly structure of the present invention includes: a first bracket and a second bracket arranged side by side, the first bracket having a hub integrally extending from the first bracket to the second bracket, the hub having a connecting end connected with the first bracket, the connecting end being formed with an opening, the hub further having a close end distal from the opening, the hub being formed with a shaft cavity communicating with the opening; a silicon steel plate unit fitted around the hub and sandwiched between the first bracket and the second bracket; a circuit board fitted around the hub and adjacent to the second bracket; a rotor including an annular magnet arranged around the locator of the motor, the rotor having a central shaft rotatably fitted in the shaft cavity of the hub; and a base seat connected with the close end of the hub.

The present invention can be best understood through the following description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective exploded view of the locator assembly of the present invention;

FIG. 2 is a perspective exploded view of the fan of the present invention;

FIG. 3 is a sectional assembled view of the motor assembly structure of the present invention;

FIG. 4 is a perspective exploded view of a conventional locator assembly of a motor; and

FIG. 5 is a sectional assembled view of the conventional motor assembly structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 to 3. The motor assembly structure of the present invention includes a first bracket 1, a silicon steel plate unit 2, a second bracket 3, a rotor 4 and a base seat 5.

The first bracket 1 has a hub 11 integrally extending from the first bracket 1 to the second bracket 3. The hub 11 has an opening 12 formed on a top face of the first bracket 1. The hub 11 has a connecting end 10 connected with the first bracket 1 and a close end 13 distal from the opening 12. The hub 11 is formed with a shaft cavity 14 communicating with the opening 12. In this embodiment, a magnet 131 is embedded in the close end 13 for attracting a central shaft 41 of the rotor 4 and keeping the central shaft 41 in a central position.

The silicon steel plate unit 2 is fitted around the hub 11 of the first bracket 1. In this embodiment, the silicon steel plate unit 2 is composed of multiple silicon steel plates which are piled up.

The silicon steel plate unit 2 is sandwiched between the first bracket 1 and the second bracket 3. The first bracket 1 is formed with several connecting holes 15 at intervals, while the second bracket 3 is formed with several connecting holes 31 at intervals corresponding to the connecting holes 15. Several insertion pins 150 are fitted through the connecting holes 15, 31 to fixedly connect the silicon steel plate unit 2 with the first bracket 1 and the second bracket 3. A coil 32 is then wound around the first bracket 1, the silicon steel plate unit 2 and the second bracket 3.

A circuit board 16 is fitted around the close end 13 of the hub 11 and adjacent to the second bracket 3. The circuit board 16 is also fixed with the insertion pins 150, whereby the first bracket 1, the silicon steel plate unit 2, the second bracket 3 and the circuit board 16 together form a locator assembly (not denoted) of the motor.

Referring to FIGS. 2 and 3, in this embodiment, the rotor 4 includes several vanes 42 and an annular magnet 40 arranged around the locator of the motor. The central shaft 41 of the rotor 4 is rotatably fitted in the shaft cavity 14 of the hub 11. A wall of the shaft cavity 14 is formed with an annular protrusion 141 immediately adjacent to the opening 12 of the shaft cavity 14. The outer circumference of the central shaft 41 is formed with an annular groove 411 complementary to the annular protrusion 141. The annular protrusion 141 of the shaft cavity 14 is snugly inlaid in the annular groove 411 of the central shaft 41.

When assembled, the insertion pins 150 are fitted through the first bracket 1, the silicon steel plate unit 2 and the second bracket 3 to fix the silicon steel plate unit 2 around the hub 11. Such procedure is easy.

The coil 32 is then wound around the first bracket 1, the silicon steel plate unit 2 and the second bracket 3. The first bracket 1, the silicon steel plate unit 2, the second bracket 3 and the circuit board 16 together form a locator assembly. The shaft cavity 14 of the hub 11 serves as a self-lubricating bearing in which the central shaft 41 can be rotated.

The base seat 5 has a connecting socket 51 in which the close end 13 of the hub 11 is fixedly plugged. According to the above arrangement, the present invention has the following advantages:

-   -   1. The first bracket and the hub are integrally formed as a         module which can be easily assembled.     -   2. The first bracket of the locator assembly itself has a hub so         that the number of the components is reduced to lower the         manufacturing cost. In addition, the tolerance of the assembly         of the components is minified so that the quality of the product         can be enhanced.     -   3. The first bracket and the hub are integrally formed so that         the locator assembly has stable quality and prolonged using         life.     -   4. The labor for assembling the components is reduced and the         components can be automatically mass-produced. Therefore, the         production capacity is greatly promoted and the cost for the         labor is reduced.     -   5. The integrated structure has stronger structural strength so         that the motor assembly structure is not subject to damage of         external force.

The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention. 

1. A motor assembly structure comprising: a first bracket and a second bracket arranged side by side, the first bracket having a hub integrally extending from the first bracket to the second bracket, the hub having a connecting end connected with the first bracket, the connecting end being formed with an opening, the hub further having a close end distal from the opening, the hub being formed with a shaft cavity communicating with the opening; a silicon steel plate unit fitted around the hub and sandwiched between the first bracket and the second bracket; a circuit board fitted around the hub and adjacent to the second bracket; a rotor including an annular magnet arranged around the locator of the motor, the rotor having a central shaft rotatably fitted in the shaft cavity of the hub; and a base seat connected with the close end of the hub.
 2. The motor assembly structure as claimed in claim 1, wherein a wall of the shaft cavity is formed with an annular protrusion adjacent to the opening of the shaft cavity, an outer circumference of the central shaft being formed with an annular groove complementary to the annular protrusion, whereby the annular protrusion of the shaft cavity is snugly inlaid in the annular groove of the central shaft.
 3. The motor assembly structure as claimed in claim 1, wherein a magnet is embedded in the close end of the hub.
 4. The motor assembly structure as claimed in claim 1, wherein the rotor further includes several vanes. 